seegeaot



(No Model.) 3 Sheets-Sheet 1.

H. C. SERGEANT.

ROCK DRILL.

Patented Q Z2, 1885.

fu l

e I I 3 Sheets-Sheet 2.

(No Model.)

H- C. SERGEANT.

ROOK DRILL.

(No Moda.) 3 sheets-sheet 3.

H. C. SERGEANT.

ROCK DRILL.

No. 326.597. Patented Sept. 22, 1885.

5o may HENRY o. SERGEANT, oF NEW Yonk N I 7 ROCK-DRILL.

SPECIFICATION forming part of Letters Patent NO. 326,597, datedSeptember 22, 1885.

Application filed October 13, 1884. No model.)

T0 all whom it may concern:

Be it known that l, HENRY G. SERGEANT, of the city and county ot NewYork, in the State of New York, have invented anew and usefulImprovement in Rock-Drills and other Engines, of which the following isa specification.

My invention relates -in part to the devices employed for cushioning theblow of the piston upon either cylinder-head of a rook drill, wherebygreater simplicity, durability, and efficiency are secured than inrock-drills heretofore used.

Theinvention also relates to a novel construed tion and combination ofparts for rotating the piston, piston-rod, and drill, as hereinafterdescribed, whereby simplicityT of construction and certainty ofoperation are secured.

The invention also relates to a valve of novel construction forcontrolling the admission of actuating-fluid to the drill-cylinder, andwhich is also applicable to other engines or Inachines, especially thosewherein are employed a reciprocating piston working in a cylinder, suchas chipping-machines,riveting-machines, and hammers operated by steam orair.

In the accompanying drawings, Figure l is a vertical sect-ion ot' adrill embodying my invention, showing it adapted and adjusted fordrilling holes at aslightinclination to the perpendicular. Fig. 2 is afront elevation of the drill. Fig. 3 is a sectional view of a portion ofthe cylinder, and an exterior view of the piston, piston extension, androtating devices. Fig. is a sectional view on the line 0c x, Fig. 3.Fig. l is a side view of the drill lying nearly horizontal. Fig. 5 is asectional View on the line *i iii, Fig. 2. Fig. 6 is a horizontalsection on the line y y, Fig. l. Fig. 7 isa sectional view of a portionof a drill embodying a modification ot' my invention` Fig. 8 is aksectional view similar to Fig. 6, but on a larger scale, of my improvedvalve and such parts of the drill-cylinder as are necessary toillustrate this part of the invention, and Fig. 9 is an end view of thevalve.

Similar 'letters of reference designate corresponding partsrin all thegures.

A designatesa strongbut light frame,which be made of cast metal, andwhich in some respects 1s similar to the ordinary drill-backthat is tosay, the drill-cylinder ll is afl/'HSM- the drill forward to the frame Ais slotted longitudinally at Ait, and the sides of the slot formparallel guides a, to which are fitted gibbed slides b at the back ofthe cylinder B.

The feed-screw C is iitted to a bearing, o, in the top of the frame A,whereby its lengthwise movement is prevented, and engages a nut, bili,in one of the slides l). On the screw C is a crank or handle, C', and byturning the screw the cylinder may be moved in the back or frame A in awell-known manner.

The back or frame A is broadened near the lower end, and comprisessockets d. in which are fitted points or centers e, which bear on therock and form two oi' the three bearing points or feet ofatripod-support. The points or centers c are secured in place byset-screws e', which have, or may have, pointed or conical heads, asshown best in Fig. 5, and for a purpose hereinafter described. orbearing-point of the tripod-support is furnished by a back brace or leg,hich is pivoted to the drill-back A by means of a bolt, f, which passesthrough an eye in the head g of the brace, and through lugs or ears f onthe back or frame A. The leg or back brace may be set at any angledesired, and may be there clamped by a hand nut, f2, as best shown inFig. 6. The back-brace is extensible,or capable of elongation andcontraction, and, as here shown, consists of an uppertubular section, D,and a lower section, D', sliding telescopically in the -uppersection,and secured in any desired relation thereto by means of a collaror band, D2, sliding upon the exterior ot' the tubular brace-section D,and provided with a set-screw, h, the point of which passes through aslot, di, in the tubular section D. The point of the screw h enters aslight depression in the extensible section D of the brace, and hencethe band or collar D`Z is caused to slide along the exterior of thetubular section as the section D slides in the interior thereof. Vhenthe screw h is tightened, it forces the extensible section D' tightlyagainst the inner side of the tubular section D and draws the band orcollar IV tightly against the exterior of the tubular section D.

The three les or bearing-points form an adequate support ier themachine, and ii` Who/1 innig/i 1110i/ ro agent 0f rely lli'gli prati bletherein to feed work. The back or The third foot J, and hence acts as anut to turn the piston and drill. I

The piston-extension in both examples of my invention has more spiralgrooves n than are necessary for the engagement of the lugs on the ringJ*, four grooves being here shown. The grooves which are not engaged'bythe nutj serve for the passage of steam or motive tluid` to act upon theend of the piston or pistonextension. I

What I claim as my invention,and desire toj secure by Letters Patent,isl l. The combination, with the cylinder, piston, and cylinder-head ofa rock-drill, of a; spring for holding the head in place with ai`yielding pressure, consisting of a steel plate bent or deflectedbetweenits ends and having,k a bearing against the outer side of thehead,` substantially as herein described.

2. The combination, with the cylinder, pis@ ton, and cylinder-heads of arock-drill, ot` bolts connecting the said heads, and a springyinterposed between the upper head and the bolt-s, and consisting of asteel plate bent or `deflected between its ends and bearing on the upperhead, substantially as herein described.

3. The combination, with the cylinder andl heads B B B2, and bolts H,connecting the heads and provided with nuts, of the spring I, consistingof a bent steel plate having a bearing on the head B', and having earsor lugs m, which receive said bolts, substantially as herein described.

4. The combination, with the cylinder of a rock-drill and a piston andspirally-grooved' pistonextension, of two rings provided withratchet-teeth on their adjacent faces and receiving the piston-extensionthrough them, one of said rings being secured in the cylinder, and theother being engaged with the spiral grooves of the piston-extension, anda spring .supporting the last-mentioned ring and holding it inengagement with the ring secured in the cylinder,substantially as hereinde- 5. The combination, with the cylinder, piston, and spirally-groovedpiston-extension ofa rock-drill, of two rings receiving thepistonextension through them and provided with ratchet-teeth on theiradjacent faces, one ring 6. The combination, with the cylinder, piston,and spirally-grooved pistonextension of a rock-drill, of two ringsreceiving the pistonextension through them and provided withratchet-teeth on their adjacent faces, one of said rings being held byfriction against turning in the cylinder and the other being engagedwith the spiral grooves of the piston-extenson, and a spring for holdingthe last-mentioned ring in engagement with the other ring, substantiallyas herein described.

7. The combination, with the cylinder, piston, the spirally-groovedpiston-extension,and the cylinder-heads of a rock-drill, of the rings JJ ik, provided with ratchet-teeth on their adjacent faces, the ,ring Jbeing clamped between the lower head and a shoulder in the cylinder, aspring for supporting the ring J*, bolts connecting the heads, and acushioningspring serving to hold the heads in place and to clamp thering J and hold it by friction against turning, substantially as hereindescribed.

8. The combination, with the cylinder B, having the shoulder n, thepiston andv piston-extension, and the lower head, B, with the projectingring or bush n', of the ratchettoothed rings J J the former having aflange, n2, whereby it is clamped between the shoulderl n3 and the ringor bush n', all substantially as herein described.

9. The combination, with the cylinder and piston, the cylinder having anintermediate exhaust port or passage across which the piston travels,and a valve-casing provided at opposite ends with seats, and'portsleading therefrom to the cylinder, of a valve consisting of a skeletonstructure having heads or disks which are adapted to close against saidseats, the heads or disks of the valve. being larger in diameter thanthe seats, so that when seated a portion of the end of the valvearoundthe seat will be exposed to pressure, and having in them holes ornotches radially beyond the roo seats, substantially as hereindescribed.

10. The combination, with the valvecasing K, provided with seats p p',and ports leading therefrom, of the valve K2, having heads or disks rr', larger in diameter than said seats, ro 5 and provided with notchesor holes rl, substantially as herein described.

H. C. SERGEANT.

Vitnesses:

FREDK. HAYNEs, EMIL SCHWARTZ.

